Typewriting machine



G. W. CAMPBELL. TYPEWRITING MACHINE. APPLICATION FILED SEPT. 9. 1920.

Patented Sept. 5, 1922.A

I BY

foire fiar ifriea. j

GEORGE W. CAMPBELL, or narrare-ian, CONNECTICUT, AssieNoR To Uivnnnwooii TYPEWRITER COMPANY, or NEW Yoan, N. Y., AoonrenATIoN or DELAWARE.

TYPEWRITING MACHINE.

original application filed .une 15, 1918, Serial No.' 240,146. Divided and this application iled September 9, 1920. Serial No. 409,076. f f

To all whom t may concern:

Be it known that I, GEORGE W. CAMPBELL, a citizen of the United States, residing in Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in, Typewriting Machines, of which the following is a specification. v

This invention relates to margin stops used in connection with line-locking `mechanism for typewriting machines, and is a division of my application, No. 240,146,

led June 15, 1918.

i I provide lightly constructed margin stops to limit the movement of the carriage in either direction, said stops being-stamped and formed out of sheet-metal. Simplicity of construction, lightness and a minimum number of parts are attained.

Other features and advantages will hereinafter appear. v

In the accompanying drawings,

Figure 1 is a rear view of an Underwood portable typewriting machine, showing the invention applied thereto. a

Figure 2 is a fragmentary front view of the machine, showing the platen displaced for the purpose of positioning the righthand margin stop.

Figure 3 is a sectional view through the left-hand margin stop (right-hand` in Figure 1), showing it assembled on the stop bar.

A carriage 10, comprising the usualV paper platen 11, travels on guideways 12 secured to a relatively fixed frame 13. 'Ihe carriage is moved rightwardly, in Figure 1 which is a rear view, as the typing proceeds, and may be arrested by a margin stop 14 adjustable on a rack-bar 15 at the rear of the machine.

A lever 16,-pivoted at 17 on the carriage, engages a projection 18 on the left-hand margin stop 14 to cause the stop-bar to travelr with the carriage to lock the typekeys through means including a link 20, as described in said application. The lever 16 is provided with shoulder 21 to engage the projection 18. A key 22 on said lever 16, when depressed, swings the shoulder 21 free of the projection 18 on the margin stop 14 and unlocks the type-keys, so that the carriage may be fed and typing performed after the typist has been cautioned The carr1age`may be rarrested in itsv re- -4 turn'movement byy a shoulder 23, onA the .lever 16,' which engages va projection 24a onV4 a right-hand margin stop 24; the latter being also adjustable on the rackebar 15.

To adjust the margin stops 14 and 24, each is provided with a finger-piece 25 integrally formed with a Cfshaped transverselymovable dog member or slide 26, which has formed thereon a pawl or dog 27 to engage teeth 28 and 30 formed on the stop-bar 15. When the linger-piece 25 is depressed against the tension of a spring 31 and moved downwardly to disengage the*` pawl from the teeth of the stop-bar 15, the margin the slide is y .of the end of the line by thelocking. of the stop may then be moved along said bar to any desired position.y The slides 26 are guided in eut-outs 32 formed in the margin stops.

It will be noted that the margin 'stops may be moved inwardly, or, in other words, toward the middle of the-machine, without depressing the finger-piece, the pawls 27` sol snapping over the teeth 28. and 30 Vof the' bar'l, but the springs are strong enough to hold said stops against accidental displacement inwardly. The margin stops are, however, positively held from being moved outwardly by thevp'awls 27 abutting against the teeth 28 yand 30.

It will be seen that the margin stops are simple in construction and are comprised of light parts which may be readilyl stamped l andvbent up from sheet-metal,thus decreasinothe cost of manufacture to a minimum.

Iy an inspection of Figure 2, itwill be seen that the front face of the rack-bar 15 isprovided with a scale 33 by which the margin stopsmay be set or located. The right-hand margin stop l24, Figure 3, is provided with a pointer 34.' yThe scale 33 is provided on the front face of the rack-bar,

so that it may readily be seen by the operator. Since the rack-bar is located in back of the carriage, the operator moves the carf riage to one side or the other when an adjustment of either margin stop is to be made.

The stopping projections 18 and 24a are .the movement of seid carriage, said stop .having a.. recessa etoothed bar around which seid stop is bent and along which said stop is adjusted, a dog or' pawl co-acting With the teeth of said bei* for locking said marginal stop against displacement, a @shaped slide ivorkingvin said recess on seid marginal stop, e finger-piece on seid slide for actuating sind pewl, said paivl being struck np from said slide, and a spring or holding said slide in effective position.

2. lhe combination with a lrook having teeth on one edge, of 2L margin gage oom- Qrising e `bodv bent around said rack to slide thereon? seid body having yonone side '1., recess, and :i movable dog member fitting sud recess, and having a finger-piece whereby it may be depressed to release its dogg and also having a .returning spring; said dog member iT-shaped in orosssection and comprising one side which lies against seid rack Within the recess inl said body, and also comprising n` portion bent around said bod),7 opposite said recess; @portion oiseid dog member et thebendfthereo being `bent Q to form-the dog. I i

vGERGC lV, CAMPBELL.

"Witnesses L. M. DoBsoN, A S. NEVILLE. 

